JPS61164045A - Central fuel injection type fuel supply system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] A. Field of Industrial Application The invention generally relates to a throttle body type fuel injection system, and more specifically to a system for variably controlling the flow of air and fuel into a guide passage. Slot that can slide axially for ) # * 'e relating to what is said.

More particularly, a concentric fuel injector is provided for spraying fuel over and into the nitrous/fuel conduit passageway, and air and fuel into the engine. The present invention relates to an air throttle body having an axially O'J-moving throttle-type sleeve chamber by means of a fuel pressure covert that narrows the flow of fuel in a manner that also atomizes this fuel.

BACKGROUND OF THE INVENTION Throttle bodies with mouths, prior art fuel injectors and/or longitudinally sounding throttle valves are known, as are throttle valves actuated by fuel pressure actuated bellows. For example, U.S. Patent No. 4,500.5 by Knapp et al.
No. 06 shows a dome-shaped throttle fP that can be pivoted below the fuel injector in the guide passage of the throttle body. U.S. Pat. No. 4,108,127 to Chavin et al. shows in FIG. 2 a rotatable double-cone equalizer cell located below a fuel injector with an overlapping opening in which the cone controls the flow by 1fflJ. Indicates something that has. Chroma U.S. Patent No. 6.9
No. 16.846 shows a matched valve arrangement in an engine intake manifold for controlling fuel and air flow in a rotary engine.

Chandra's US tri! 'F No. 2,025,091 shows a conventional fuel pressure movable bellow rotating a conventional carburetor throttle valve in FIG.

However, from the above it can be seen that the nitrogen gas is located just below the fuel injector and cooperates with the valve seat on this throttle body to atomize the fuel to variable control of the air/fuel flow in the labyrinth-like passage. give it a thrust effect, l1
controlled by vertical movement of a hoT-capable cup-shaped member;
The square is designed to balance the air pressures acting on opposite faces of the throttle valve to minimize the force required to move the valve during engine idling conditions when the pressure differential across the valve is high. It will be clear that the throttle body with means is not shown.

OBJECTS OF THE INVENTION Accordingly, a first object of the present invention is to provide an axially movable air/fuel mixture cooperating with a valve seat for variably metering the air/fuel flow rt in a manner that also atomizes the fuel. having fuel metering valve means;
The object of the present invention is to provide a throttle body of the type mentioned above.

The purpose, percentage and advantages of uninvented wandering are its long-lasting
It will become clearer with reference to the detailed description and drawings showing preferred embodiments thereof.

2. Embodiment The throttle body 10 of the present invention includes a double housing consisting of a main fuel charge and an upper core horn or cover s12 bolted to the lower mating portion 14 of the throttle body. The upper part 12, as seen in FIG. It is meant to be combined in order to receive it. The lower portion 14 is adapted to be bolted onto the engine's intake manifold (not shown) to subject the throttle body to changes in the vacuum level therein.

The air horn 12 is essentially L-shaped in cross section with a square paper flange 16. This 72-inch flange mates with a similarly shaped flange 18 made on the upper combustion chamber 14, with an annular gasket 20 interposed therebetween. The inlet end of this air horn is illustrated with a concave oval shape that provides compactness and a low profile.

It is shaped with a well-shaped housing for mounting therein a fuel injector 24t' of the type known from 22.

This housing 12 allows air to flow around the lower part of this injector housing to cool the injector fuel, while also maintaining an annular air flow in a guide passage 26 made in the lower body part 14. is designed to do so. To flange 1B,
As shown, there is a flare-shaped opening at the entrance to the passage 26 to minimize the restriction of air flow into this guide passage.

The fuel injector 24 is located on the entrance to the guide passage 26 and directs fuel into it. Spray t in a conical pattern indicated by /M27
They are mounted concentrically.

The flow jL of air and fuel through this guide passage 26 is controlled by an axially movable or slidable throttle valve 28. The latter essentially consists of three parts: a vertically movable dome-shaped valve member 30, a stopper 32, and a fixed valve seat 34. It has an inverted cup shape forming an outer surface and a flat horizontal inner surface 38 .

Both ml are integral with an annular vertically descending 11411 wall 40.

The movable valve member 30 is supported on and slides on a stationary support 32. The latter, as best seen in FIGS. 2 and 6, is essentially T-shaped and has a flat button-like upper chin 42 that mates with a flat lower 1tii 38 of the fP member 30. The main body of support 32 is defined by four circumferentially spaced vertically extending legs 44 . This interval is
Create four windows or passages 45' that connect the air and fuel flow 'fc# wall 40 around the lower wall 0ik 46 and from below the top 42 into the guide passage 26.

The guide passage 26 in this case is defined by the central hole 48 of the washer-like extension s50 of this throttle body lower part 14, which includes the valve seat 34. More specifically, the throttle pod portion 14 has a circularly extending annular projection on the lower mounting flange 54 defining a stepped diameter bore 48 . This step 56 serves as a vertical stop for positioning the support 32t' which may be pressed into this hole. Protrusion 5
2 is made with a conical surface 5B forming a valve seat cooperating with the inner edge 46 of the wall 40 and metering the flow of air and fuel therethrough.

A central longitudinal hole 60 is formed in the support 32 in which a sealed fluid pulp or bellows 62 is located. The bellows is connected at its lower end to a fuel passageway 64 interconnecting a pressurized source of fuel and a control valve 66 as shown. The fuel droplet in this case is the same as that which supplies fuel to the injector 24, as shown at 67. but,
It will be clear that it can be any suitable fuel source under the control of an electrical control unit that can be selectively or automatically activated.

The supply of fuel to the bellows 62 connects it to the dome-shaped valve member 3
0 and push it upwards thereby increasing the air/fuel flow gap between valve seat 40 and valve seat 58. In turn, a decrease in fuel pressure will cause the bellows to collapse against the domed surface of member 30 as it catches air and fuel.

FIG. 1 shows that dome 30 has an air pressure equalization passage TO connecting the outer and inner surfaces of the dome. this is,
It essentially equalizes the air pressure on both sides of the dome to reduce the actuation force required to move the dome member at engine idle or throttle settings. More particularly, when the engine is in idle speed operation, the position of the dome member 30 is essentially the same as shown in FIG.
It is. The lower edge 46 of the wall 40 essentially contacts the conical valve seat 58 to provide as much airflow as is necessary for engine idle speed operation. At this time, the top of the dome member is essentially in contact with the top of the T-shaped support 32. green 4
The pressure differential across the small opening 68 between the 6 and 9P seats 58 will be due in large part to the high engine manifold vacuum.

Milled mating edges 72.74 of dome and T member
provides a seal along this - so that the engine's commercial suction force would normally result in a high unbalanced nitrogen force r acting downwardly on the dome 30. This would require a large counterforce from Bellow 62 to surround this square. However, the air vent passage IO compensates for this by equalizing the pressure on both sides of the dome member, thereby minimizing the force required to move the valve member 30 vertically.

The air vent passage shown in FIG.
Alternatively, it has an upper extension 76 that constitutes a defined fuel deflection plate to minimize the power of the canister. FIG. 4 shows another configuration,
There, the upper surface 78 of the dome member 30' is flat in this case, and the air vent passage member 7 Ll' is made for the same purpose.

Ho0 Effect I believe that the effect is obvious from the above explanation, so I will not describe it in detail. However, briefly stated, during operation at engine idle speed, the fuel injector 24, which is pulsed in ms to provide a predetermined fuel flow schedule, directs a scheduled flow of fuel through its nozzles. It will emit into the conical ladder pattern shown. At the same time, this engine's manifold tool will induce 2"L of nitrogen. Eye H+
In ring speed operation, the throttle valve member 30 in the position shown provides minimal flow front in the annular flow path 68. A portion of the intake air will be weighed down by the amount of nitrogen in this gap. The labyrinth passages formed by these parts and indicated by the arrows create a shearing effect on the fuel, thereby effectively atomizing the fuel and mixing it with air for efficient combustion.

Bellow 6 in response to the operator's normal depression of the accelerator pedal
2 will tension this Perot fc# and raise the dome valve member 30 proportionately.

An edge-actuated partial pressure gauge type position sensor 80 is controlled by a controller 66 to stop movement of the valve member when it is out of proper position.
It may also be useful to provide a feedback signal to the user.

It will be appreciated that the valve member 30 may alternatively be coupled to a conventional vehicle accelerator pedal by a direct mechanical linkage, and movement of the valve member 30 may be mechanically controlled.

From the above, it can be seen that the present invention provides controlled a]' variable-plane airflow into the throttle body and the carrot, adapted for use with a centrally located It-type fuel injector and a unidirectionally slidable throttle body. It is also possible to eliminate the conventional rotatable throttle fP in order to provide a flow that imparts an atomization effect to the fuel to atomize the fuel in a manner that facilitates efficient operation of the engine. You'll understand.

Although the invention has been illustrated and described in the preferred embodiment thereof, it will be apparent to those of ordinary skill in the art to which the invention pertains that many modifications and changes may be made thereto without departing from the scope of the invention. Obviously, modifications can be made.

[Brief explanation of the drawing]

FIG. 1 is a schematic VFR view of the throttle body of Kinoi 131. FIG. 2 is a fine line looking up at the details shown in FIG. FIG. 6 is a perspective view of the detail of FIG. FIG. 4 is a diagram similar to FIG. 1 showing rash shaping. 24...Fuel injector means 26...Air/fuel guide passage 2B...Air/fuel throttle valve means 30...Dome-shaped valve member 34...Conical slope 4u...Side wall portion 48... ... Central opening 62 ... Bellows 68 ... Air/fuel flow path TO170' ... Opening means

Claims (7)

[Claims] (1) A penetrating air/fuel guide passage (26) in a central fuel injection fuel supply system for an automotive internal combustion engine.
a wall forming a passageway opening at one end to air at essentially atmospheric pressure levels and connected to the intake manifold of the engine at the opposite end to subject the passageway to fluctuating vacuum levels therein; an air/fuel throttle body having means (24) for discharging fuel axially into the passageway in a conical spray pattern; Air/fuel throttle valve means (28) within this passage for controlling the flow of air and fuel to the intake manifold.
), the valve means comprising an annular washer-like valve seat having a central opening (48) and an axially movable dome-shaped valve member (30).
), which arrangement forms a controlled air/fuel flow path (68) between the member and the valve seat that varies in area as a function of their axial separation; Opening means (70) in the dome-shaped member allow air to pass to both sides of the member to essentially equalize the pressure on both sides, thereby reducing the force required to move the member axially and allowing the fuel to flow through the dome-shaped member. The passage of the fuel through this controlled flow path creates a shearing action on the fuel to atomize the fuel. (2) The fuel system of claim 1, wherein the dome-shaped member is vertically spaced radially inwardly from the base and the wall means and cooperates therewith to form a controlled flow path. The system has an inverted cup shape with depending annular side walls (40). (3) A fuel system according to claim 2, wherein the valve seat includes a conical slope (34) adjacent to the inner edge forming the central opening (48), the slope forming a lower edge of the side wall. system that cooperates with the system to form a controlled flow field therebetween. (4) Claim 3 provides a fuel system in which the member is located concentrically within the passageway downstream of the injector means and controls the flow of fuel discharged therefrom by gravity. system for receiving flow at the upstream face of this member for directing flow downwardly into the flow path area. (5) A fuel system according to claim 3, further comprising fuel pressure responsive means operatively coupled to the dome-shaped member for axially moving the dome-shaped member to change the controlled flow area. Including system. (6) A fuel system according to claim 5, wherein the fuel response means is an inflatable bellows (62). (7) The fuel system according to claim 1, wherein the opening means has a plurality of openings that are activated when the valve member is engaged with the valve seat and closed during engine idling speed. (70') at the base.